It's been quite a while since I brewed with kits, but when did priming with honey become standard practice? This is the first I have heard of this. Are the kit makers trying to save a few cents by not including corn sugar any more?
Hello? Sample case of one? Insufficient data? Jump to conclusions?
One recipe kit choosing honey for one particular style of beer does not make it the new "standard practice". And if the kit makers were trying to save a few cents, they'd have suggested table sugar which is easier, more standard and more neutral than honey.
This is simply a matter of the makers of *this* beer thought honey would taste good with this particular style. You *have* seen recipes that use honey, DME, maple syrup and other alternatives, haven't you? These recipes aren't attempting to define a new standard, are they?
That said, you are absolutely correct that corn sugar is the standard and can always be used. If you don't feel comfortable with a recipe's call for hibiscus-infused agave nectar, you can also keep it simple (and cheaper) and use corn sugar. The flavor-loss is pretty minimal and priming sugar really isn't the place to add flavor anyway. It's a rare beer in which using an "exotic" priming agent will make any difference. But there are some styles in which a priming agent will give it just a nice little nudge.
Anyway... honey, give it time. Honey's more complex so it'll take longer to carb. Just give it two more weeks.
In future, use a priming sugar calculator and measure by weight, not volume.